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In conventional BCS superconductors, the electronic kinetic energy increasesupon superfluid condensation (the change DEkin is positive). Here we show thatin the high critical temperature superconductor Bi-2212, DEkin crosses overfrom a fully compatible conventional BCS behavior (DEkin>0) to anunconventional behavior (DEkin<0) as the free carrier density decreases. If asingle mechanism is responsible for superconductivity across the whole phasediagram of high critical temperature superconductors, this mechanism shouldallow for a smooth transition between such two regimes around optimal doping.Comment: 3 pages, 2 figure

Kinetic energy change with doping upon superfluid condensation in high-temperature superconductors